// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/android/disambiguation_popup_helper.h"

#include <stddef.h>

#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/platform/WebVector.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_conversions.h"

// these constants are copied from the implementation class
namespace {
const float kDisambiguationPopupMaxScale = 5.0;
const float kDisambiguationPopupMinScale = 2.0;
} // unnamed namespace

namespace content {

class DisambiguationPopupHelperUnittest : public testing::Test {
public:
    DisambiguationPopupHelperUnittest()
        : kScreenSize_(640, 480)
        , kVisibleContentSize_(640, 480)
        , kImplScale_(1)
    {
    }

protected:
    const gfx::Size kScreenSize_;
    const gfx::Size kVisibleContentSize_;
    const float kImplScale_;
};

TEST_F(DisambiguationPopupHelperUnittest, ClipByViewport)
{
    gfx::Rect tap_rect(1000, 1000, 10, 10);
    blink::WebVector<blink::WebRect> target_rects(static_cast<size_t>(1));
    target_rects[0] = gfx::Rect(-20, -20, 10, 10);

    gfx::Rect zoom_rect;
    float scale = DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
        tap_rect, target_rects, kScreenSize_, kVisibleContentSize_, kImplScale_,
        &zoom_rect);

    EXPECT_TRUE(gfx::Rect(kVisibleContentSize_).Contains(zoom_rect));
    EXPECT_LE(kDisambiguationPopupMinScale, scale);

    gfx::Size scaled_size = gfx::ScaleToCeiledSize(zoom_rect.size(), scale);
    EXPECT_TRUE(gfx::Rect(kScreenSize_).Contains(gfx::Rect(scaled_size)));
}

TEST_F(DisambiguationPopupHelperUnittest, MiniTarget)
{
    gfx::Rect tap_rect(-5, -5, 20, 20);
    blink::WebVector<blink::WebRect> target_rects(static_cast<size_t>(1));
    target_rects[0] = gfx::Rect(10, 10, 1, 1);

    gfx::Rect zoom_rect;
    float scale = DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
        tap_rect, target_rects, kScreenSize_, kVisibleContentSize_, kImplScale_,
        &zoom_rect);

    EXPECT_TRUE(gfx::Rect(kVisibleContentSize_).Contains(zoom_rect));
    EXPECT_EQ(kDisambiguationPopupMaxScale, scale);
    EXPECT_TRUE(zoom_rect.Contains(target_rects[0]));

    gfx::Size scaled_size = gfx::ScaleToCeiledSize(zoom_rect.size(), scale);
    EXPECT_TRUE(gfx::Rect(kScreenSize_).Contains(gfx::Rect(scaled_size)));
}

TEST_F(DisambiguationPopupHelperUnittest, LongLinks)
{
    gfx::Rect tap_rect(10, 10, 20, 20);
    blink::WebVector<blink::WebRect> target_rects(static_cast<size_t>(2));
    target_rects[0] = gfx::Rect(15, 15, 1000, 5);
    target_rects[1] = gfx::Rect(15, 25, 1000, 5);

    gfx::Rect zoom_rect;
    float scale = DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
        tap_rect, target_rects, kScreenSize_, kVisibleContentSize_, kImplScale_,
        &zoom_rect);

    EXPECT_TRUE(gfx::Rect(kVisibleContentSize_).Contains(zoom_rect));
    EXPECT_EQ(kDisambiguationPopupMaxScale, scale);
    EXPECT_TRUE(zoom_rect.Contains(tap_rect));

    gfx::Size scaled_size = gfx::ScaleToCeiledSize(zoom_rect.size(), scale);
    EXPECT_TRUE(gfx::Rect(kScreenSize_).Contains(gfx::Rect(scaled_size)));
}

} // namespace content
